%quaking%

a. & n. from Quake, v. [ 1913 Webster ]

Quaking aspen (Bot.), an American species of poplar (Populus tremuloides), the leaves of which tremble in the lightest breeze. It much resembles the European aspen. See Aspen. --
Quaking bog, a bog of forming peat so saturated with water that it shakes when trodden upon. --
Quaking grass. (Bot.) (a) One of several grasses of the genus Briza, having slender-stalked and pendulous ovate spikelets, which quake and rattle in the wind. Briza maxima is the large quaking grass; Briza media and Briza minor are the smaller kinds. (b) Rattlesnake grass (Glyceria Canadensis). [ 1913 Webster ]